dm: sound: Add conversion to driver model

Move the existing hardware drivers over to use driver model.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/dts/exynos5250-smdk5250.dts b/arch/arm/dts/exynos5250-smdk5250.dts
index 8b69544..bf60b82 100644
--- a/arch/arm/dts/exynos5250-smdk5250.dts
+++ b/arch/arm/dts/exynos5250-smdk5250.dts
@@ -62,6 +62,7 @@
 	i2c@12C70000 {
 		soundcodec@1a {
 			reg = <0x1a>;
+			u-boot,i2c-offset-len = <2>;
 			compatible = "wolfson,wm8994-codec";
 		};
 	};